Initializes search fields when user opens advanced search overlay.

<div class="definition">
    initSearches()
</div>

Returns <i>undefined</i>.

<h4>Description</h4>

This method is called internally after advanced search overlay has been displayed and it will set initial values in the search 
fields. This is an internal method, but it can be overwritten.
<div style="height: 10px"></div>